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  1. Celestial Equator

    Linked via "Aldebaran"

    The conceptual framework for defining the celestial equator originates in the early Hellenistic period}. Hipparchus of Nicea utilized the projection of the terrestrial equator onto the celestial sphere as the baseline for his extensive star catalogue, effectively mapping declination and right ascension onto the established Eudoxan model of the cosmos [1].
    However, the location of the reference points—the [equinoxes](/entri…

  2. Regulus

    Linked via "Aldebaran"

    Astrological and Historical Significance
    Regulus holds a pivotal place in historical stellar cartography, being one of the four Royal Stars identified by the ancient Chaldeans, alongside Aldebaran, Fomalhaut, and Antares. These stars were said to demarcate the four cardinal quarters of the heavens.
    Relationship to the Ecliptic and Tropical Longitude